[XeTeX] Porting XeTeX

[Joel C. Salomon]

A question for Jonathan et al.:  What is required of an operating
system to port XeTeX to it successfully?  A C compiler?  C++?
OS-level support for OpenType?  Is porting freetype sufficient?  A
different library?

I'm asking mainly because of Plan 9, a UNIX-like OS with a C compiler
(but no C++) to which the freetype library has been ported.  There's
an old port of TeX that doesn't work too well anymore, so there's been
some talk about porting a modern TeX.  (LuaTeX requires C++ for the
PDF library it uses, so that's out for now.)

--Joel